tests: net: dns_resolve: Add tests for dns_unpack_name()

Verify that dns_unpack_name() generates a valid DNS name when unpacking
records and that it returns an error in case of overflow.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
(cherry picked from commit 7a9ca8e410d141eb8e6ed2eb5433eec6da5aa679)
1 file changed